Micro-foamed dense adhesive and automotive sealant strip

By using specific formulations and processes for micro-foamed dense adhesive materials, the balance between lightweight, mechanical properties, and dimensional stability of automotive sealing strips has been solved. This achieves the advantages of lightweight cost reduction, high density, and high structural strength, thereby improving the reliability of automotive seals.

CN122278065APending Publication Date: 2026-06-26TAICANG ENLICHENG SEAL CO LTD
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Patent Information

Application Number
CN202610603750.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-06
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing automotive sealing strips use dense adhesive materials that struggle to achieve a good balance between lightweighting, mechanical properties, and dimensional stability, failing to meet the automotive industry's multiple demands for high performance, low cost, and lightweighting.

Method used

It is made of micro-foamed dense rubber material, prepared through a specific formula and process, including a combination of raw rubber, filler system, softening system, microporous foaming system and vulcanization system, and vulcanized by microwave and hot air to form an integrated composite structure.

Benefits of technology

It achieves lightweight sealing strips, reduces material consumption, improves mechanical properties and dimensional stability, meets high-precision assembly requirements, and enhances reliability. It is suitable for applications such as automotive door sealing strips.

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Abstract

This invention belongs to the technical field of automotive sealing rubber materials, specifically relating to a micro-foamed solid rubber and automotive sealing strips. The micro-foamed solid rubber uses two types of EPDM rubber with specific Mooney viscosity, ethylene content, and ENB content as the raw rubber system, combined with a microporous foaming system containing a thermally expanding microsphere foaming agent, and an optimized filling, softening, and vulcanization system. Through the synergy of the above formulation and preparation process, the rubber compound forms a uniform microporous closed-cell structure during vulcanization. The resulting micro-foamed solid rubber significantly reduces density, achieves lightweighting, and reduces material consumption while maintaining good mechanical strength and excellent dimensional stability, and is not easily shrunk or deformed after molding. The resulting automotive sealing strips can balance the advantages of low density and cost reduction with the requirements of high structural strength and high assembly precision, making them particularly suitable for sealing applications in automotive doors and other parts.
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